1 / a better / an improved / 更好的
2 / a branch / a division / 分支
3 / a plentiful / an abundant / 丰富的
4 / abandon / give up / 放弃
5 / abide by / stick to / 坚持，遵循
6 / abnormal / unusual / 不正常的
7 / abrupt / sudden / 突然的
8 / accelerate / step up / 加快
9 / acceptably / satisfactorily / 令人满意
10 / acclaim / hail / 向欢呼
11 / account / consideration / 要考虑的事
12 / account for / explain / 解释
13 / accumulate / collect / 积聚
14 / aircraft / planes / 飞机
15 / alleviate / lessen / 减轻
16 / allocate / assign / 分配
17 / allocate / distribute / 分配，分布
18 / allow / permit / 允许
19 / almost / practically / 几乎
20 / although / while / 引导让步从句
21 / annoying / irritating / 使不愉快
22 / argue / contend / 争辩
23 / arise / get up / 起床
24 / arouse / excite / 使激动
25 / assemble / gather / 聚集
26 / assert / state firmly / 断言
27 / assume / postulate / 假定
28 / at any price / for love or money / 不惜任何代价
29 / at stake / in danger / 在危险中
30 / attend to / wait on / 伺候